Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu area

[Eric W. Biederman]

Andi Kleen <andi@xxxxxxxxxxxxxx> writes:

> ebiederm@xxxxxxxxxxxx (Eric W. Biederman) writes:
>>
>> Has anyone investigated using the technique gcc uses for thread local storage?
>
> I investigated a long time ago (given when the binutils/gcc support
> was much more primitive) and my conclusion back then was that doing 
> the same for kernel module (negative addresses) would need 
> new relocation types.  And the pain of a binutils change didn't
> seem worth it.

Thanks.  That does seem to be the fly in the ointment of using the
builtin linker support.  The kernel lives at negative addresses which
is necessary but weird.

If the @tpoff relocation doesn't work for us we clearly can't use
the support.  I will have to look and see if usable relocation types
are generated from @tpoff.

Eric

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